code release

xlib/qt/gui/QXPixmap.py

@@ -0,0 +1,51 @@
+from PyQt6.QtCore import *
+from PyQt6.QtGui import *
+
+
+class QXPixmap(QPixmap):
+    """
+    extension of QPixmap
+
+    contains cached scaled versions
+    cached grayscaled
+    cached QIcon
+    """
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self._cache = {}
+
+    def scaled_cached(self, width: int, height: int, aspectRatioMode: Qt.AspectRatioMode = Qt.AspectRatioMode.KeepAspectRatio) -> 'QPixmap':
+        """
+        get scaled version from cache or create.
+        """
+        key = (width, height)
+        pixmap = self._cache.get(key, None)
+
+        if pixmap is None:
+            pixmap = self._cache[key] = QXPixmap( self.scaled(width, height, aspectRatioMode=aspectRatioMode, transformMode=Qt.TransformationMode.SmoothTransformation) )
+
+        return pixmap
+
+
+    def as_QIcon(self) -> QIcon:
+        icon = self._cache.get( QIcon, None )
+        if icon is None:
+            icon = self._cache[QIcon] = QIcon(self)
+        return icon
+
+
+    def grayscaled_cached(self) -> 'QXPixmap':
+        """
+        get grayscaled version from cache or create.
+        """
+        key = 'grayscaled'
+        pixmap = self._cache.get(key, None)
+        if pixmap is None:
+            pixmap = QXPixmap(self)
+            qp = QPainter(pixmap)
+            qp.setCompositionMode(QPainter.CompositionMode.CompositionMode_SourceIn)
+            qp.fillRect( pixmap.rect(), QColor(127,127,127,255) )
+            qp.end()
+            pixmap = self._cache[key] = pixmap
+
+        return pixmap